Enigma

C++ implementation of Enigma.

The Enigma machine is a cipher device developed and used in the early- to mid-20th century. It was employed extensively by Nazi Germany during World War II, in all branches of the German military.

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Installation

Clone repository:

git clone https://github.com/SamNzo/enigma.git

Build enigma:

cd enigma
chmod +x make.sh
./make.sh

The enigma binary is then in the build directory.

Usage

The simplest way to use it is:

./enigma --message <your message>

If no information is provided about the rotors, reflector and plugboard the default configuration is:

Reflector	Left rotor	Middle rotor	Right rotor
B	I AA	II A A	III A A

You can customize it by choosing up to 4 rotors, 1 reflector and 1 plugboard.

For each rotor you can choose a wiring, ring setting and starting position:

./enigma --left-rotor I A A --middle-rotor II A A --right-rotor III A A --reflector B --message <your message>

To know which rotors wiring are available: ./enigma -h rotor

To know which reflectors wiring are available: ./enigma -h reflector

To get more information about the plugboard: ./enigma -h plugboard

For more information: ./enigma -h

Example

To encode the message ENIGMA using 3 rotors (II, IV, I) with respective ring settings WAR, starting positions SUN, reflector B and plugboard A-F, D-G, R-M:

./enigma --left-rotor II W S --middle-rotor IV A U --right-rotor I R N --reflector B --plugboard AF DG RM --message ENIGMA
AORWCK

Note: since Enigma is self-reciprocal, to decode the message simply use the configuration used to encode it on the ciphered message

Machine overview

The Enigma machine, used extensively during World War II, was a remarkable encryption device. It consisted of a keyboard, a set of rotating wheels called rotors, a reflector, and a display panel. When a letter was pressed on the keyboard, an electrical signal passed through the rotors, which had intricate internal wiring. Each rotor had a different wiring configuration, causing the input signal to be scrambled in a complex manner. The rotors rotated with each key press, altering the wiring connections and ensuring that a letter was not always encoded by the same character. After passing through the rotors, the signal was reflected back through the wiring, further scrambling the message. The encrypted letter was then displayed on the panel.

To decrypt the message, the receiver had to know the exact settings used by the sender, including the initial rotor positions and wiring configurations. The Enigma machine's encryption was considered highly secure at the time, but it was eventually cracked by codebreakers, notably mathematician Alan Turing, leading to a crucial breakthrough in cryptography.